Machine-switching telephone-exchange system



@een 25 i923.

R. S BAILEY MACHINE swITcHING TELEPHONE EXCHANGE SYSTEM Filed Feb. 2C,1920 2 Sheets-Sht www.

@and 5. @ai/ey Dec. 25, 1923. A www@ R. S. BAILEY MACHINE SWITGHINGTELEPHONE EXCHANGE SYSTEM Filed Feb. 20, 1920 2 Sheets-Sheet 2 Ffa/7d 5.50i/ey.

. faire` r OFMONTCLAIB, NEW JERSEY, ASSIGNOB TO ERICAN TEL or" A.CORPORATION OF N YORK.

Panarea nec. as. rea.

l maaar D S. BAILEY;

'.AND-TELEGBIAPH COMPANY,

u: ons

l E-SWITCHING TELEPHONE-EXCHANGE SYSTEM.

" application med rebmary ao, 1920. serial na. asomaV To all whomz't mayconcern.'

Beit known that I, RAND S. BAlLEY, residing at Montclair, in the countyof Essex@ and citate of New Jersey, have invented certain Improvementsin Machine-Switching Telephone-Exchange Systems, of which the followingis a specification. Y

This invention relates to machine switching telephone exchange systems.

A feature of the inventlon is the provision of an improved and simpliedimpulse sender of the type in which the desired number is first set upby a plurality of setting members, said setting members being thenr'eleased to send out a set of series of impulses in accordance with thenumber set up. In accordance with this -feature of the invention,a'plurality of longitudinally movable members are arranged adjacent toeach other, and are adapted to be manually independently set to apredetermined position depending on the number that it is desired to setup. Operation of a key connects the impulse sender to a cord or trunkcircuit and causes the members to be successively released so as to sendout impulses in accordancewith the number set up on the sender. Afterthe members are returned to normal position the impulse sender isautomaticallyl disconnected from the cord or trunk circuit. A furtherfeature in a'sender of this type is the provision of means whereby,after a number has been setup and the sender associated with the cord ortrunk circuit, the movable members of the sender may beindependentlyreset to change such number without sending false impulses over theoonnected circuit.

. A still further feature is the provision of means controlled bytheoperator, for transferring the sender after the number has been set upfrom a connecting circuit with which it has been connected to anotherconnecting circuit. v

In the drawings an impulse sender is represented in connection withacord circuit at a manual operators position in which the operator maycontrol the setting of selectorv switches -.(not shown) at an automaticexchange, only Vas much being shown of the circuit arrangement as isnecessary for an understanding of the invention. lt will be l apparenthowever that the impulse sender forming the Subj ect matter of this'invention may readily be adapted tor use in systems o 2 represents asectional widely varying character such as electric signalmg systems,etc.

Fig. 1 is a partial view of the impulse sender with parts broken to showa portion of the interior mechanism of the device; Fig. view along theline 2--2 of Fig. l, Fig. 3 shows a sectional view along the line 3-3 ofFig. 1, and Fig. 4 represents diagrammatically the connections of thecalling device when used in connectioii with a cord circuit.

Similar letters of reference are used to dei l ignate `the same partswherever shown the drawings. I

The impulse sender as shown in Figs. Lto

3, comprises fourlongitudinally movable members arranged adjacent toeach other. These members are independently movable to and from theirnormal position. Three of the members are shown in their normal positionwhile the top. member is shown moved to a osition such that on itsreturn to normal t ree actuations of the pulsing contacts associatedtherewith would occur. Each member comprises a slidable member 12 havin-a 'pair of shoes on each end such as 13 an 14 adapted to ride in asupporting member 15. The su porting mem l suitably secured to -shaped'straps 2 which are screwed to an operators keyboard 3.y A casing 4screwed to the sender from injury and dust. A mask 6,

berslare 'i sa l straps `2 protects the a partial view of which isshown, is screwed to the keyboard 3, and covers the movable members whenin their oH-normal position. Rigidlefixed to the slidable member 12 is anum r plate 10 having the numbers 1 to 9, inclusive, and 0 appearingthereon at suitable intervals apart. Above the, number' plate 10, andfixed thereto is a fin er hold plate 11. Rigidly fixed to each num rplate 12 is a toothed member 19, the teeth on the member being placedthe same distance a art as the numerals on the number plate. he teeth ofmember 19 cooperate with a pair of pulsing springs 16 individual theretoto interrupt a circuit rupon the return to normal of the movable 'membenThe pulsing springs 16 are suitably mounted upon the supporting member15.

Associated with the longitudinally movable members and individual.thereto are cunter' weighted dogs' 18 which are :mtatably mounted upon ashaft 32 secured to a support 30. The left-hand portion oiz tbm@ sesllt@

engage notches such as 17 in the upper unr portion of member 12 andserve to hold the longitudinally movable members in a set position untilreleased by the operator.

There are also levers 33 individual to each longitudinally movablemember which are rotatably secured to a shaft 31 fixed to the support30. Each lever 33 is` provided with an arm 45 which is adapted to engagea tripping nger on the number plate 10. When a movable member 12 returnsto normal position, engagement of the tripping finger 80 with the arm 45rotates the lever 33 about its axis thereby causing arm 34 of said leverto engage a pin 35 fixed to the dog 18 associated with the next movablemember, thus rotating and causing the re# lease of said movable member.

Associated with each movable member 12 is an adjusting key 20 by meansof which a number may be reset. Operation of the key causes a pair ofcontacts 21 to be operated to short circuit the conductors leading tothe pulsing contacts 16 and thus prevent impulses from being-sent and,at the same time, by 'means of a notch 40 in the shank of key 20 and apin 41 on the lever 33, an arm 421of lever 33 is caused to engage a pin43 on its associated counter weighted dog 18, thereby rotating the dogout of engagement with the notch 17 of the movablev member 12 andpermitting the movable member to return to normal position. A pavvl 60may be provided for engaging notch 61 in the lower part of the shank ofkey 20, in order. to hold the key 20 in the depressed position until themovable member reaches normal position, when a pin 62 secured to the arm23 disengages the paWl and releases the key. The operator can thenreadjust the sliding member as desired Without sending false impulsesover the line. The parts 60, 61 and 62 maybe omitted, however, in whichcase the operator, `Where a slide has been pulled out too far, may resetthis slide by tapping the key 20 to restore the slide step by step tothe desired position. This will in some instances be quicker than torestore the slide to its initialposition and again withdraw it, as isnecessary when parts 60,61 and 62 are provided.

lIndividual to each movable member is a regulating device for governingthe speed of the return to normal. This device is here shown as adash'pot. A tube 25 is suitably secured. to an angle iron 26 which is inturn suitably secured to supporting member 15. A rod 55 is fastened atone end to the arm 23 of its associated movable member and at the otherend to a piston 36 which rides in the tube 25. By means of a set screw38, the amount of air passing through an aperture 39 in the end of thetube 25 can be adjusted, thereby regulating the return speed of thereturning dial.

Otherdetails of the mechanism will more the drawing only one movablemember is shown moved from normal position and this member would be forthe thousands di lt of the number. In case, for example, it 1s desiredto call the number 3 4 5 6, the remaining members would be successivelymoved to a position in accordance with the digits of the number desired.Appearing then in a vertical row at the right end of the stop would bethe number 3 4 5 6. The retractile springs 28, fastened at one end tothe arm 23 of the movable member 12 and at the other end to a pin 22 andinclosed in a tube 24, will be prevented from restoring the movablemember to normal by the counter weighted dog 18 which will be enaged ina notch 17 in a sliding member 12.

peration of non-locking key 115 shown in Fig. 4 causes energization ofmagnet 117. Upon energization of magnet 117, armature 70 is attracted,thereby causing the arm 71, which is pivotally ixed thereto by a in 72,to move` the in 35, secured to the og 18, u Wardly. T e dog 18 isthereupon rotated a out its axis and is disengaged from thc notch 17 ofthe movable member 12, therebj)7 permitting said member to return tonormal under the pressure of spring 28. As the movable member returns tonormal, three teeth will engage the pulsing contacts 16 which causesthree interruptlons of the ciicuit. The pulsing contacts 16 are suitablyspaced normally from the first tooth of the movable member so thatduring the latter part of the travel of the return movement of thcmovable member all thc pulsing teeth will have passed the pulsingcontacts which creates a time interval necessary to complete theoperation of the selective switch in the automatic exchange.

Just prior to the return of the first s lide to normal position, thetripping finger 8O will engage the arm 45 and rotate lever 33 about itsaxis thereby causing the arm 34 to release the.dog 18 associated withthe next movable member. The second movable member will then be returnedto normal and in a like manner will engage the pulsing contacts so as tointerrupt the circuit four times. ln a like manner the third and fourthmembers will be returned to normal and impulses will be sent inaccordance with the numberset up. It will be noted -that, suitablyfastened to the member '12, there is a pin 8 which cooperates with apair of contacts 50 when the member l2 is in normal position. Thesecontacts yare normally open invasie whereas, when the member-S12 are ina set position the contacts are closed.

Referring to lFig. l of the drawings, a trunk circuit C comprisingconductors 105 and 106 may extend from a manual to an automaticexchange. There is provided a cord circuit B for establishin connectionsbetween the telephone linel and trunk circuit C.

The operator, a connection is desired between the line A (which may beconnected with the cord circuit B in any desired well known manner) anda .subscriber in an automatic exchange (not shown) connection with whichmust be established by way of the trunk circuit C extending from themanual to automatic en.

change, inserts plug 110 ot the cord circuit B in to jack 111 oi thetrunk circuit C.

The longitudinally movable members of Fig. 1 are then set in accordancewith the number desired as heretofore described. As soon as any movablemember has been moved from its normal position, the contacts 50individual thereto, are closed. This causes energization of relay 101,which at its front Contact and armature places ground on the conductor102 which is common to allthe cord circuit-s or a position. rl`heoperator then depresses a non-locking 'lrey 115 which closes a circuitfor rela 116 over the following path: grounded battery, contacts ot key115, winding ol relay 116, conductor 102, armature and tront'- contactof relay 101, to ground. Upon energization, relay 116l loclrs up over acircuit including its front contact and right-hand armature, andgrounded battery and, at its left-hand armatures interrupts the'continuity of the talking conductors or the cord circuit and connectsthe impulse sender to the cord cir-= cuit. V/hen non-locking key 115was'actuated to energize relay 116, magnet 117 was also energized.Magnet 117 upon energizetion attracts its armature 70, thus releasingthe tirst movable member. Upon return of the first movable member tonormal position, the remaining members will be successively released andreturned to normal in the manner heretofore described.

. ln case it is desired for any reason to de"Y lay the transmission orimpulses, the iirst movable member can be prevented `trom releasing whenthe dialing lzey 115 is op erated by holding the movab e member in placewhen actuating hey 115. 'lhe member can then be released by subsequent`operation ot lgey 115.- Should it be found desirable to release theslides mechanically instead ot electromagnetically, the releasing magnet117 can be omitted and a releasing key can be provided to perform thesame functionas is electromagnetically performed by magnet 117.

When all movable members have returned.

having been advised that to normal contacts 50 will be opened andthereby causing its deenergization. rlhe locking circuit for relay 116is thus interrupted at the front Contact and the armature of relay 101,causing deenergization of relayA 116 thereby disconnecting the impulsesender `from lthe cord" circuit and restoring the continuity .of thecord circuit.

By the pTrov1s1on of a master release key 120, means are provided forthe transferring of the impulse sender from one cord circuit to anotherafter a number has been set up. @poration of key 120 opens a circuittor/relay 101 which in turn opens the circuit for relay 116. @perationof hey 115 which is individual to each cord circuit will then connectthe impulse sender to that particular cord circuit and release theimpulse sending mechanism.

A mechanism capable of sending numbers containing up to four digits hasbeen shown and described. 'lhe invention is not, however, limited tosuch a construction, as it is evident that units containin the sameparts for each digit could be ad ed without introducingundue mechanicalcomplications, thereby producing structures capable of mnding numberscon aiming any number oit digits. 1

What is claimed is 1. ln a telephone system, a connecting circuit, animpulse sender for transmittin a plurality ot series of implulses oversaid circuit comprising a plura ty ot longitudinally movable memberseach provided with hnger holds so vthat they may be variably set, manualmeans for releasing one of the members, and means actuated under controlof said member for causing the successive release ot the remainingmembers;

2. ln a telephone system, an impulse sender comprising a plurality oflongitudinally movable members having a normal relationship to eachotherand independently movable therefrom, means by which any one of saidmembers may be variably moved trom its normal position, individualsprings arranged to return said members to normal position, and contactmaking devices operated by the movable members.

3. ln a telephone system, an impulse sender comprising a plurality ofsliding members each oi which is provided with nger holds, means forvariably setting said members independently, a series ol teeth on eachmember, a set of contacts for each memico ber, means by which said teethactuate said contact sets upon the return oil a member' to its normalposition, individual springs lor returning said members to normalposition, and regulating means for governing the Tpeed ot the return tonormal of said mem.-

ers.

t? lu a telephone system, an impulse lli@ titl

sender comprising a plurality of manualyl slidable members each of whichis indepen ently movable from and back to normal position, individual'springs for returning said members, means by which such return movementWill actuate a set of electrical contacts, and means for consecutivelyreturning said members to normal position.

5. lln a telephone system, a connecting circuit, means for transmittinga plurality of series of impulses over said circuit, said meanscomprislng a plurality of longitudinally movable contact actuatingmembers adapted to be moved from normal position to a predeterminedposition representing the impulses desired to be sent, means for lockingsaid members in the set position, a key in said connecting circuit, andcircuit connections whereby actuation of' said key associates saidimpulse transmitting means with said circuit and releases said membersto send out impulses. v

6. lin a telephone system, a connecting circuit, an impulse sendercomprising a plurality of longitudinally movable members, means forsetting said members, means for locking said membersl in their setpositions, means whereby any member may be reset Without affecting theremaining members, and means for releasing said members.

7, ln a telephone system, a plurality of connecting circuits, an impulsesender adapted to be set and locked, switching means individual to eachconnecting circuit for connecting said sender to any of said circuitsand for releasing said sender to transmit a set of series ot impulsesover said circuit.

8. ln a telephone system, a' plurality of connecting circuits, animpulse sender adapted 'to be set and locked, a relay and a keyindividual to each of said connecting circuits for associating saidsender with any of said circuits and releasing said sender to transmit apluralityo't series of impulses over said circuit.

9. ln' a telephone system, a pluralit oi connecting circuits, an impulsesender a apted to be set and locked, switching means individual to eachconnecting circuit, multiple leads `from said sender to each switchingmeans whereby the actuation ci any switching means connects the senderto tbecorre- ,spending connecting circuit and releases the sender toroducea ynumber of `sets of im- A pulses in t l0. lin a telephonesystem, a plurality oi e said connecting circuit.

integere.

connecting circuits, an impulse sender adapted to be set and locked,means for connectin'g said sender to any of said connecting circuits,means for restoring said sender, means for automatically disconnectingsaid sender from said connectlng circuit upon the restoration of thesender, and manual means for independently disconnecting said senderfrom saidconnecting circuit.

11. ln a telephone systerr a plurality of connecting circuits, animpulse sender adapted to be set and locked, means for connecting saidsender to any1 of said connecting circuits, and means for` vtransferringsaid sender from the circuit to which it has been connected to any otherof said plurality of connecting circuits, Without releasing the sender.

12. ln a calling device, a plurality of lon-v gitudinally movablemembers one for each digit place of a number to be called, means formanually moving said members to a posltlon corresponding to the numberto be called, means for locking said members, means for releasing one ofsaid members, and automatically .operated means controlled by the firstmember released for releasing consecutively the other members.

18. .ln a 4calling device, a plurality of longitudinally movable membersone for each digit place of a number to be called, means for manuallymoving said members to a position corresponding to the number to becalled means for locking said members, means for releasing one of saidmembers,

automatically operated means controlled byl the iirstV member releasedfor releasing consecutively the other members, and a set of contactsactuated by each member during its release.

la. ln a 'calling device, a plurality of lonvmeans for releasing one ofsaid members, automatically operated 4means controlled by the firstmember released for releasing consecutively the other members, and meansfor mit resetting any member Without releasing the remaining members. 4

lin testnnony whereof lliave signed my name to this specilication this19th day of February, 1920.

llt-AND S. BALEY.

